Journal of Experimental Botany, Vol 49, 747-752, Copyright © 1998 by Oxford University Press
P Sowinski, W Richner, A Soldati and P Stamp
Even moderate chilling temperatures may cause important modifications in
assimilate movement in maize seedlings from the shoot to the roots, but
there is no information on long-distance transport of assimilates in plants
subjected to vertical gradients of moderately low temperatures in the root
zone. Seedlings of a chilling-tolerant (KW1074) and a chilling-sensitive
inbred line (CM109) of maize were grown in a system that allowed the
maintenance of temperature gradients between the topsoil (0-10 cm) and the
subsoil (10-50 cm). After pregrowth at 24
ARTICLES
Assimilate transport in maize (Zea mays L.) seedlings at vertical low temperature gradients in the root zone
Plant Breeding and Acclimatization Institute, Plant Biochemistry and Physiology Department, PO Box 1019, 00-950 Warszawa, Poland; ETH Zurich, Institute of Plant Sciences, ETH Zentrum, CH-8092 Zurich, Switzerland; Corresponding author
C
until the third-leaf stage, plants were subjected to chilling-stress
regimes for 6 d (17/17/17C,
17/17/12°C, 12/12/12°C, 12/12/17°C,
air/topsoil/subsoil). The time taken for the assimilates to enter the
phloem from the second leaf increased at low temperatures for both lines,
but to a much greater extent in CM109. Although mainly influenced by air
and topsoil temperature, low temperature in the subsoil also affected this
trait in CM109. The speed of assimilate transport between the second leaf
and the mesocotyl in KW1074 was strongly reduced by cool temperatures in
the shoot and topsoil as well as by 12°C in the subsoil in CM109,
because the latter line had a larger portion of its root system in the
subsoil as compared to KW1074. The portion of assimilates allocated to the
root decreased at low temperatures in both lines, but to a greater extent
in CM109, and was controlled mostly by the subsoil temperature. After
rewarming, values of all measured parameters of assimilate transport
returned to near pregrowth levels within a few days.Keywords:
Assimilate transport, low temperature stress, root growth,
vertical soil temperature gradients, Zea mays L.
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